Isn't that how they work now?

No, the programs only accept tzx files. I have tried renaming file extensions and trying again and it still does not work.

So you want to convert from digital to analog signal?

http://en.wikipedia.org/wiki/Digital-to-analog_converter

I have actually started on a program to do this. The language I am using though, is lacking functions.

You might find something you can use here, but I'm guessing...

http://www.analog.com/en/audiovideo-products/video-codecs/products/index.html

Friend, I don't believe this is a digital to analog conversion. If I understand the question correctly, it is a desire to convert a given file into a pulse stream of binary 0's and 1's that follow a given format. Therefore, our original poster needs to know the particular format or syntax for the tzx format. Then he can convert his bitmaps into this format. Both are binary data, but the syntax has to be exact. If not, then the interpreter that is reading the data will see invalid characters or erroneous characters in many places in the data stream.

Sorry, but I do not know this format. I suspect that the strong support that existed for this early computer and its continuing language means that people are out there who can answer this question.

--JMM

Google is your friend.

http://www.worldofspectrum.org/formats.html

I have created a program that writes 1 and 0 as pulses to a wav file when you press 1 and 0. All I need is a program that can view a file in binary and not hex. I could then copy the binary digits into my software to create the analogue signal.